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<head><meta charset="utf-8"><title>Wellformed Placeholder Types · wg-traits · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/index.html">wg-traits</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Wellformed.20Placeholder.20Types.html">Wellformed Placeholder Types</a></h3>

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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/144729-wg-traits/topic/Wellformed%20Placeholder%20Types/near/218348241" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Matthew Jasper <a href="https://rust-lang.github.io/zulip_archive/stream/144729-wg-traits/topic/Wellformed.20Placeholder.20Types.html#218348241">(Nov 30 2020 at 21:25)</a>:</h4>
<p>How do we want to handle <code>forall&lt;T&gt; { WellFormed(T) }</code>? Currently this evaluates to "No possible solution", since we require <code>FromEnv(T)</code> to prove that a placeholder is well-formed. But we don't appear to generate <code>FromEnv(T)</code> when checking whether <code>struct A&lt;T&gt; { ... }</code> is well-formed.</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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